Perform the Indicated Operations and Simplify , And $\mathrm { C } = \left[ \begin{array} { r r r } 7 & - 9 & 0 \\ 3 & - 5 & 1 \\ - 1 & 6 & 2 \end{array} \right]$

Multiple Choice

Perform the indicated operations and simplify.
-Let $\mathrm { A } = \left[ \begin{array} { r r } 3 & - 4 \\ - 2 & 5 \end{array} \right] , \mathrm { B } = \left[ \begin{array} { r r r } 5 & - 2 & 8 \\ 1 & 0 & - 3 \end{array} \right]$ , and $\mathrm { C } = \left[ \begin{array} { r r r } 7 & - 9 & 0 \\ 3 & - 5 & 1 \\ - 1 & 6 & 2 \end{array} \right]$ . Find $\mathrm { AB } + \mathrm { BC }$ .

A) $\left[ \begin{array} { r r r } 68 & 3 & 31 \\ 8 & - 2 & - 5 \end{array} \right]$

B) $\left[ \begin{array} { r r r } 32 & 7 & 50 \\ 5 & - 23 & - 37 \end{array} \right]$

C) $\left[ \begin{array} { r r r } - 10 & - 19 & 12 \\ - 15 & 31 & - 25 \end{array} \right]$

D) $\left[ \begin{array} { r r r } 32 & 19 & 40 \\ - 15 & 31 & - 37 \end{array} \right]$